Thermodynamic Assessment of the Co-Ti System

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2024-05-20 DOI:10.1007/s11669-024-01094-y

Mykhailo Turchanin, Pavlo Agraval, Anna Vodopyanova, Liya Dreval

引用次数: 0

Abstract

A new thermodynamic assessment of the Co–Ti system is presented on the basis of the literature data concerning phase equilibria and thermodynamics. A set of parameters of Gibbs-energy expressions for phases is obtained by means of CALPHAD approach. Excess Gibbs energy of fcc, bcc, and hcp disordered solutions is modeled using Redlich-Kister polynomials. The thermodynamic properties of liquid alloys are described using the associate solution model. Compound Energy Formalism is used to describe the thermodynamic properties of Laves C15 and C36 phases and order-disorder transformations L1₂-A1 and B2-A2 by applying of the corresponding two-sublattice models. The CoTi₂ compound is treated as stoichiometric. The phase diagram, coordinates of invariant equilibria, and thermodynamic properties of liquid and solid phases are calculated. Metastable phase transformations with the participation of supercooled liquid alloys and boundary solid solutions are analyzed.

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钴-钛系统的热力学评估

根据有关相平衡和热力学的文献数据，对 Co-Ti 系统进行了新的热力学评估。通过 CALPHAD 方法获得了一组相的吉布斯能表达式参数。使用 Redlich-Kister 多项式对 fcc、bcc 和 hcp 无序溶液的过吉布斯能进行了建模。液态合金的热力学性质使用联溶模型进行描述。化合物能量形式主义用于描述 Laves C15 和 C36 相的热力学性质，并通过应用相应的双子晶格模型来描述 L12-A1 和 B2-A2 的有序-无序转变。CoTi2 化合物被视为化学计量化合物。计算了液相和固相的相图、不变平衡坐标以及热力学性质。分析了过冷液态合金和边界固溶体参与的嬗变。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.